(a)  
Remove the parts to be measured.

 (b)  
Use a micrometer to measure the dimensions of these parts.

 (c)  
Compare the part dimensions to the limit dimensions.

 (d)  
If the part dimension is out of tolerance, replace the part.

 (e)  
Install all the parts removed to do the check.

 S 426-008
 (3)  Do this task: "Variable Camber Flap Actuating Linkage Installation" (AMM 27-81-08/401).
 TASK 27-81-08-216-006
 3. Variable Camber Flap Actuating Linkage Visual Inspection/Check
______________________________________________________________
 A. References
 (1)  
AIPC 27-81-02, Fig. 1

 (2)  
AIPC 27-81-02, Fig. 5

 (3)  
AIPC 27-81-02, Fig. 10

 B.
Access

 (1)  
Location Zone
 522 Variable Camber Flap, LH
 523 Variable Camber Flap, LH
 524 Variable Camber Flap, LH
 525 Variable Camber Flap, LH
 526 Variable Camber Flap, LH
 532 Variable Camber Flap, LH
 533 Variable Camber Flap, LH
 534 Variable Camber Flap, LH
 535 Variable Camber Flap, LH
 536 Variable Camber Flap, LH
 537 Variable Camber Flap, LH
 622 Variable Camber Flap, RH
 623 Variable Camber Flap, RH
 624 Variable Camber Flap, RH
 625 Variable Camber Flap, RH
 626 Variable Camber Flap, RH
 632 Variable Camber Flap, RH
 633 Variable Camber Flap, RH
 634 Variable Camber Flap, RH
 635 Variable Camber Flap, RH
 636 Variable Camber Flap, RH
 637 Variable Camber Flap, RH

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 27-81-08
 ALL  ú ú 01 Page 605 ú Feb 18/01
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 C. Procedure
 S 216-007
 (1)  
Examine the actuating linkage and the torque tube:

 (a)  
Examine all the worn areas of the bushings and bolts for excessive freeplay.

 (b)  
Examine the thread worn areas on all the parts with threads.

 (c)  
Examine the torque tubes for excessive freeplay, corrosion and worn areas.

 NOTE: The worn areas must be smooth and at the center on the
____
 teeth.

 (d)  If the part dimension is out of tolerance, replace the part.
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 27-81-08
 ALL  ú ú 01 Page 606 ú Jun 10/94
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 OFFSET GEARBOX - REMOVAL/INSTALLATION
_____________________________________
 1.  General_______
 A.  There are two tasks in the procedure. There is one task for the removal and one task for the installation of the offset gearbox on the drive shaft. The procedure has these parts:
 (1)
The installation of the safety locks at the leading edge flaps

 (2)
The removal of the offset gearbox

 (3)
The installation of the offset gearbox

 (4)
A check of the retract stop clearance.

 B.  
Adjacent to the two Krueger flaps drive units is an offset gearbox. Try not to move the flaps and the drive unit during the removal and installation procedure. It is then not necessary to adjust the flaps or the drive unit when you install the gearbox.

 TASK 27-81-16-004-001
 2.  Offset Gearbox Removal______________________
 A.  Special Tools and Equipment
 (1)
17MIT65B04017 Leading Edge Flap Drive Unit Lock

 B.  
References

 (1)
24-22-00/201, Manual Control

 (2)
27-81-00/201, Leading Edge Flap System

 (3)
29-11-00/201, Main Hydraulic Supply System

 (4)
36-00-00/201, Pneumatic System

 (5)
IPC 27-81-16 Fig. 1

 (6)
IPC 27-81-51 Fig. 1
　
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